London to Glasgow by Train

I don't know the exact answer, but I always check this well regarded website for anything train.
https://www.seat61.com/train-travel-in-britain.htm

I used to use The Trainline, but now on reading this site, I book direct on the Avanti West Coast site.

Quickest way is London Euston to Glasgow Central direct, from memory 4 hours 20 minutes or 30 minutes.

When I am trying to find train info in the UK, I use
https://www.nationalrail.co.uk/

You can use the journey planner to see what the options are.

There's no point in booking with a third party - it's best just to book directly with the train operating company. From memory, the operators for this route at Avanti (from Euston) and LNER (from Kings Cross). There is also a sleeper, but that's probably not what you're looking for.

You can book a ticket with any UK train operator for any route - I normally just book with the company operating the route I'm traveling on, but you can book with others.

Alternatively, you can just go to the National Rail site, search the route you want, and it will direct you to the train operator site to book: https://www.nationalrail.co.uk/

FYI there is no longer a British Rail - it was privatised in the 1990s.

As GerryM stated, the fastest services--around 4 hour and 30 minutes--will be on Avanti West Coast from London Euston Station to Glasgow Central.

You didn't give us a date but tickets are available around 12 weeks before the date of travel.

I also agree that you should buy directly from the Avanti West Coast website or download their app. (I purchased via the app last month and it was easy.)

BTW, British Rail no longer exists.

4:20 is the time Euston to Motherwell I think. That's what I've being doing most recently. Motherwell Station has been seriously refurbished in recent times. Frank II, as you're a connoisseur of all things Scottish, I'd recommend you explore North and South Lanarkshire if you don't know it.

Thanks all! Obviously I have not been to Britain for 30 years and missed the memo on British Rail being privatized! I saw the Avanti site and looks like the best option.

You're due quite fair compensation if your trains are delayed or cancelled. My round trips have cost me very little on the last two occasions. I claimed on the web at home but you can link the "Delay Repay" system to your ticket easily if you install the Avanti West Coast app.

Avanti are usually very fast at approving their Delay Repay claims, and at reminding you to make them. I was on a badly delayed service on Wednesday and at every station announcement we were told about delay repay as well.
Delayed by the effects of the storm.
As it was I didn't qualify as the delay just used up all my 56 minute buffer time for my connecting train.

LNER only run one train a day to Glasgow Central, all others are Scotrail connections Edinburgh to Glasgow Queen Street.

About 4:35 to 4:40 journey time on Avanti, book ahead and you should get a train specific fare for £35, for the 401 mile journey- 4;31 is the fastest service.

If you see a longer journey time of over 5 hours when buying tickets then it is one of the Avanti trains which runs via the West Midlands/Birmingham.

One of the reasons I like to buy my rail tickets in the app--besides the convenience of having my tickets in the app--is the ease of delay replay. Usually just one click of a button.

If you aren't familiar....if your train is 15-29 minutes late you get a 25% refund, if 30-59 minutes late you get a 50% refund and If your train is over an hour late, you get a 100% refund.

Make sure you opt-in for delay repay when purchasing your ticket. Like Gerry M, many of my last few rail journeys saw money coming back to me.

The quoted delay repay amounts are on single fares. If you are on a return ticket then you get half the quoted amounts, unless the train is over 2 hours late.

Buying on the website (as opposed to the app) you can also opt in to automated delay repay.

Book on the Avanti west coast website. Best prices will be for tickets called "advance" and are for a specific time, if you arrive at the station early, you must wait for your precise train. Many of us go for this type of ticket.
If it costs you more than £90 on your rail travel while over here, you will benefit from buying a railcard costing £30 but will save you a third on rail travel after 0930 during the week and all weekend. You can tick the box at the time of booking your trip indicating that you have a railcard then buy one when you are at a major station that issues them. You just need to have one when travelling. You'll need a passport type photo on your phone for it. There are various types all costing the same, including a two together which is the same price but applies to two people.
Picking a random midweek day in December, I can see single tickets for £35-£37, with a railcard £23.10, although you would need more journeys to get your money back.